I can tell you one thing that helped me while doing our customizations was simply using Visual Studios (you can use the free Express version of whatever language you are most comfortable with). Use it to open the Epicor.Mfg.Lib.EpiReportLib.dll file which in our setup is located here:
C:\Program Files\Epicor Software\Epicor905\Client\Epicor.Mfg.Lib.EpiReport Lib.dll
This is separated into Epicor.Mfg.Lib.Report and Epicor.Mfg.UI.FrameWork. From there you can view all the classes and information about whatever you should need.

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I can tell you one thing that helped me while doing our customizations was simply using Visual Studios (you can use the free Express version of whatever language you are most comfortable with). Use it to open the Epicor.Mfg.Lib.EpiReportLib.dll file which in our setup is located here:
C:\Program Files\Epicor Software\Epicor905\Client\Epicor.Mfg.Lib.EpiReport Lib.dll
This is separated into Epicor.Mfg.Lib.Report and Epicor.Mfg.UI.FrameWork. From there you can view all the classes and information about whatever you should need.